Circular saw



FIG. 1 is a front right perspective view of the circular saw;

FIG. 2 is a right elevational view thereof;

FIG. 3 is a left elevational view thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a rear elevational view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines and structures they depict form no part of the claimed design. 

The ornamental design for the circular saw, as shown and described. 